Urgent Help Needed PLEASE

Hi i am trying to solve a number grid problem by 4x4 block finding the product of the top left number and the bottom right number in the block doing the same with the top right and bottom left numbers. Calculating the difference so far this is what i have done

Notice that there is a difference of 3600 between the 1st and the 2nd block (29680 - 2608 = 3600)

I then did another 4x4 block where 3 was the upper left and another 4x4 block 4 as the upper left and got a difference of 3800 i am so confused can any kind person pls explain am i doing this right and how can i generate a formula of D (DIFFERENCE) involving N (NUMBER OF SQUARES). your help would be very much appreciated also if you can explain the 5x5 block
Thank you

Hi i am trying to solve a number grid problem by 4x4 block finding the product of the top left number and the bottom right number in the block doing the same with the top right and bottom left numbers. Calculating the difference so far this is what i have done

Notice that there is a difference of 3600 between the 1st and the 2nd block (29680 - 2608 = 3600)

I then did another 4x4 block where 3 was the upper left and another 4x4 block 4 as the upper left and got a difference of 3800 i am so confused can any kind person pls explain am i doing this right and how can i generate a formula of D (DIFFERENCE) involving N (NUMBER OF SQUARES). your help would be very much appreciated also if you can explain the 5x5 block
Thank you

I am assuming the number block is 10x(something)?

If you have a 4x4 block and a number n in the upper left corner, then the next number in the diagonal leading to the lower right corner will be n + 11, the number after that will be (n + 11) + 11 = n + 22, and the last number in the diagonal (the lower right corner) will be (n + 22) + 11. So the product along this diagonal will be:
n(n + 11)(n + 22)(n + 33)

To do the other diagonal, the number in the top right corner will be n + 3, the next number in the diagonal will be (n + 3) + 9 = n + 12, then (n + 12) + 9 = n + 21, then (n + 21) + 9. This product will be:
(n + 3)(n + 12)(n + 21)(n + 30)